Results 71 to 80 of about 123 (91)

Characteristics of Ventilated Supercavities in a Periodic Gust Flow

Volume 2, Fora: Cavitation and Multiphase Flow; Fluid Measurements and Instrumentation; Microfluidics; Multiphase Flows: Work in Progress, 2013
A ventilated supercavity consists of a large gas-filled bubble enveloped around an underwater vehicle that allows for significant drag reduction and an increase in maximum vehicle speed. Previous studies at the Saint Anthony Falls Laboratory (SAFL) of the University of Minnesota focused on the behavior of ventilated supercavities in steady horizontal ...
Seung-Jae Lee, Ellison Kawakami, Roger E. A. Arndt   +2 more
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Investigations of the Sound Generated by Supercavity Ventilation

2009
Abstract : An investigation is made of the sound generated by the impingement of a ventilating jet on the interface of a ventilated supercavity. A ventilated supercavity is a gaseous envelope generated around an underwater vehicle that allows for order of magnitude increases in vehicle speeds.
Alia W. Foley, Michael S. Howe
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Experimental Study of Ventilated Supercavities with a Dynamic Pitching Model

Journal of Hydrodynamics, 2008
An investigation of the ventilated supercavitation for a supercavitating vehicle pitching up and down in the supercavity was carried out in a high-speed water tunnel. The emphasis is laid on the understanding of the interaction of the vehicle aft body with the cavity boundary.
Qi-tao Lee, Lei-ping Xue, You-sheng He
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On minimum cavitation number of the ventilated supercavity in water tunnel

Science China Physics, Mechanics and Astronomy, 2013
A numerical method consisted of the cavitation number correction and the model coefficient correction algorithms is presented to simulate the supercavity in water tunnel considering blockage and gravity effects based on the Logvinovich model. A model of the minimum cavitation number is also proposed based on the dimensional analysis theory, and the ...
Wang Zou, KaiPing Yu, R. E. A. Arndt, E. Kawakami   +3 more
openaire   +1 more source

Investigation of the Behavior of Ventilated Supercavities in a Periodic Gust Flow

Journal of Fluids Engineering, 2013
A ventilated supercavity consists of a large, gas-filled bubble enveloped around an underwater vehicle that allows for significant drag reduction and increases in vehicle speed. Previous studies at the Saint Anthony Falls Laboratory (SAFL) focused on the behavior of ventilated supercavities in steady horizontal flows.
Seung-Jae Lee, Ellison Kawakami, Roger E. A. Arndt   +2 more
openaire   +1 more source

Instability of Two-Dimensional Ventilated Supercavity in a Free Jet

International Journal of Fluid Mechanics Research, 2001
The mathematical model of plane unsteady supercavity based on the two-dimensional linearized Tulin's scheme with infinite wake and finite pressure at infinity is developed. Stability of the ventilated supercavity both in the infinite stream and in the free jet is investigated. The results obtained are in a good agreement with both experimental data for
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Numerical Investigations of Pressure Distribution Inside a Ventilated Supercavity

Journal of Fluids Engineering, 2016
A numerical study has been conducted on the internal pressure distribution of a ventilated supercavity generated from a backward facing cavitator under different air entrainment coefficients, Froude numbers, and blockage ratios. An Eulerian multiphase model with a free surface model is employed and validated by the experiments conducted at St.
Lei Cao, Ashish Karn, Roger E. A. Arndt, Zhengwei Wang, Jiarong Hong   +4 more
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On the flow characteristics of two ventilated supercavities

Physics of Fluids
This study presents an experimental and theoretical investigation into the interaction of two adjacent ventilated supercavities. Governed by the Froude number (Fr) and nondimensional lateral spacing (L/Dc), the two supercavities exhibit three distinct states: symmetric, asymmetric, and restricted symmetric.
Wanning Li, Wenzhi Yan, Yu Liu, Cong Wang   +3 more
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Influence of a deflector on ventilated supercavity development and stability

Physics of Fluids
This study numerically investigated the effects of a deflector structure installed behind a disk-type cavitator on the development and hydrodynamic stability of a ventilated supercavitating flow. A multiphase volume-of-fluid model coupled with a large eddy simulation framework was employed.
Van-Duyen Pham, Byoung-Kwon Ahn
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On the flow characteristics of two staggered ventilated supercavities

Physics of Fluids
This study presents water-tunnel experiments on the interaction between two staggered ventilated supercavities, focusing on asymmetric cavity morphology, critical ventilation demand, and closure-mode transitions induced by a streamwise offset. The transverse spacing ratio is fixed at LH/DC = 5.3, while the streamwise spacing ratio LV/DC = 0, 1.67, and ...
Huacheng Mei, Wanning Li, Wenzhi Yan, Yuchen Ding, Cong Wang   +4 more
openaire   +1 more source